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How to block spam inbound and outbound through lookup DNS

TequilaYu

Hi all,

Sophos Email Appliance v.4.5.0.1

How to block spam inbound or outbound through invalid lookup DNS?

e.g. DNS lookup the FQDN mail.abcde.com > 200.200.100.100

DNS reverse lookup 200.200.100.100 > mail.aaa.com

Please kindly advise. Thanks.

 

 



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